topic Re: DNS Problem in Operating System - HP-UX

DNS Problem

NFPC — Fri, 24 Apr 2009 12:03:36 GMT

Hi,
I have a two unix servers that act as a primary and a secondary dns server. For the past few days, I have had problems gettig to msn.com or hotmail.com. All other sites work without any problems.
Any idea what is going on ?
Thanks
A/A

Re: DNS Problem

Ganesan R — Fri, 24 Apr 2009 12:38:48 GMT

Hi,

It may not be your DNS server issue. Normaly hosts outside your network will be resolved by caching domain server.

Name resolution works this way. The
resolver forwards all host name resolution queries to the domain name server. The name server looks into its own data files for a match. If a match is found, the query is answered straight away. If no match is found, the name server contacts a root name server on the Internet. The root name
server provides the address of another DNS that can resolve the host name. Your name server then contacts the name server address provided by the root name server. When it receives the IP address of the host, it relays the address back to the querying machine.

Here Primary DNS or Secondary DNS cannot do anything if clients are not able to resolve msn.com or hotmail.com

Re: DNS Problem

Steven E. Protter — Fri, 24 Apr 2009 12:43:50 GMT

Shalom,

dig command has diagnostic tools built in.

Use those tools to run verbose lookups on the servers themselves.

dig @server name type

See the man page for more information.

This problem is probably not the HP-UX Server, more likely a problem at your ISP.

Seeing error codes would help.

SEP

Re: DNS Problem

NFPC — Fri, 24 Apr 2009 12:45:13 GMT

Thanks for the response.
I am not sure where to start to get this resolved...

Re: DNS Problem

Patrick Wallek — Fri, 24 Apr 2009 12:54:50 GMT

Check your /etc/named.conf file and look for the "Forwarders" section. The forwarders are the servers that your DNS server will forward requests that it can't handle to.

Try looking up msn.com and hotmail.com via each forwarder in your list.

Re: DNS Problem

NFPC — Fri, 24 Apr 2009 13:10:36 GMT

There is no such section in the named.conf file on the primary dns server while as there is no named.conf in /etc directory in the secondary server.

Re: DNS Problem

Patrick Wallek — Fri, 24 Apr 2009 13:19:32 GMT

You **MUST** have a named.conf file somewhere on your secondary server. Perhaps in a different location?

Do you have a section in the primary named.conf that looks like:

include "forwarders.conf";

perhaps with some path to the forwarders.conf file?

The should be something there that tells DNS what to do with requests for servers it doesn't have records for.

Re: DNS Problem

NFPC — Fri, 24 Apr 2009 13:21:41 GMT

no such reference to the file

Re: DNS Problem

Patrick Wallek — Fri, 24 Apr 2009 13:25:24 GMT

Do you have **ANY** include statements in your named.conf file?

Re: DNS Problem

NFPC — Fri, 24 Apr 2009 13:33:56 GMT

none whatsoever..
this is how it looks like
directory /etc/named.data ; running directory for named
version 4.9.7
cache . db.cache
primary "domain Name" db.nfpc
primary 'Ip address'
secondary "domain Name" 192.1.1.16 db.nfpc
primary 'IP address"
db.127.0.0